Nonlinear vertical accelerations and mooring loads of a semi-submersible offshore fish farm under extreme conditions

2021 ◽  
pp. 102193
Author(s):  
Songchen Yu ◽  
Hongde Qin ◽  
Peng Li ◽  
Zhijing Xu
Keyword(s):  
Fish Farm ◽  
Extreme Conditions ◽  
Vertical Accelerations

scholarly journals Wave-Induced Accelerations of a Fish-Farm Elastic Floater: Experimental and Numerical Studies

2014 ◽  
Author(s):  
Peng Li ◽  
Odd M. Faltinsen ◽  
Marilena Greco
Keyword(s):  
Deep Water ◽  
Water Waves ◽  
Nonlinear Effects ◽  
Fish Farm ◽  
Frequency Domain Method ◽  
Frequency Dependency ◽  
Numerical Studies ◽  
Vertical Accelerations ◽  
Steep Waves ◽  
Wave Induced

Numerical simulations and experiments of an elastic circular collar of a floating fish farm are reported. The floater model without netting structure is moored with nearly horizontal moorings and tested in regular deep-water waves of different steepnesses and periods without current. Local overtopping of waves were observed in steep waves. The focus here is on the vertical accelerations along the floater in the different conditions. The experiments show that higher-order harmonics of the accelerations matter. A 3D weak-scatter model with partly nonlinear effects as well as a 3D linear frequency-domain method based on potential flow are used. From their comparison against the measurements, strong 3D and frequency dependency effects as well as flexible floater motions matter. The weak-scatter model can only partly explain the nonlinearities present in the measured accelerations.

scholarly journals Wave-Induced Accelerations of a Fish-Farm Elastic Floater: Experimental and Numerical Studies

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Peng Li ◽  
Odd M. Faltinsen ◽  
Marilena Greco
Keyword(s):  
Water Waves ◽  
Three Dimensional ◽  
Nonlinear Effects ◽  
Fish Farm ◽  
Frequency Domain Method ◽  
Frequency Dependency ◽  
Numerical Studies ◽  
Vertical Accelerations ◽  
Steep Waves ◽  
Wave Induced

Numerical simulations and experiments of an elastic circular collar of a floating fish farm are reported. The floater model without netting structure is moored with nearly horizontal moorings and tested in regular deep-water waves of different steepnesses and periods without current. Local overtopping of waves was observed in steep waves. The focus here is on the vertical accelerations along the floater in the different conditions. The experiments show that higher-order harmonics of the accelerations matter. A three-dimensional (3D) weak-scatter model with partly nonlinear effects as well as a 3D linear frequency-domain method based on potential flow are used. From their comparison against the measurements, strong 3D and frequency dependency effects as well as flexible floater motions matter. The weak-scatter model can only partly explain the nonlinearities present in the measured accelerations.

38. The Attenuation of Hearing Protectors in Extreme Conditions

2002 ◽  
Author(s):  
E. Toppila ◽  
J. Starck ◽  
I. Pyykkö
Keyword(s):  
Extreme Conditions ◽  
Hearing Protectors

Development of the ChIMES Force Field for Reactive Molecular Systems: Carbon Monoxide at Extreme Conditions

2019 ◽  
Author(s):  
Rebecca Lindsey ◽  
Nir Goldman ◽  
Laurence E. Fried ◽  
Sorin Bastea
Keyword(s):  
Carbon Monoxide ◽  
Molecular System ◽  
Interaction Model ◽  
System Size ◽  
Single Atom ◽  
Reactive System ◽  
Extreme Conditions ◽  
Ambient Conditions ◽  
Molecular Systems ◽  
Three Body

<p>The interatomic Chebyshev Interaction Model for Efficient Simulation (ChIMES) is based on linear combinations of Chebyshev polynomials describing explicit two- and three-body interactions. Recently, the ChIMES model has been developed and applied to a molten metallic system of a single atom type (carbon), as well as a non-reactive molecular system of two atom types at ambient conditions (water). Here, we continue application of ChIMES to increasingly complex problems through extension to a reactive system. Specifically, we develop a ChIMES model for carbon monoxide under extreme conditions, with built-in transferability to nearby state points. We demonstrate that the resulting model recovers much of the accuracy of DFT while exhibiting a 10<sup>4</sup>increase in efficiency, linear system size scalability and the ability to overcome the significant system size effects exhibited by DFT.</p>

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